Four of Thiokol's Castor® IVA solid rocket motors help launch a Lockheed
Martin Atlas IIAS from Launch Complex 36B at Cape Canaveral Air Force
Station. The Castor IVA strap-on motors give the Atlas IIAS a 20 percent
greater payload capacity than any other Atlas launch vehicle. The Atlas
IIAS has successfully placed all of its national and international payloads
on orbit.
On August 31, 2004 the last of the original Atlas-Centaur boosters powered
by Rocketdyne MA-5A engines launched the secret National Reconnaissance
Office NROL-1 spacecraft into orbit. It marked the end of an era in Atlas
launch vehicles.
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